Telephone system



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F. A. STEARN TELEPHONE SYSTEM Filed Dec. 4, 1926' 18 Sheets-Sheet 2fiFST CHANNEL F. A. STEARN TELEPHONE SYSTEM jan. 29, i929.

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Jan. 29, 1929.

F. A. STEARN TELEPHONE SYSTEM Filed Dec. 4 1926 18 Sheets-Sheet 11 Jan.29, 1929. 1,700,456

F. A. STEARN TELEPHONE SYSTEM Filed Dec. 4, 1926 18 Sheets-Sheet 12 Jan.29, 1929; 1,700,456

, F. A. STEARH I TELEPHONE SYSTEM Filed Dec. 4, 1926 18 Sheets-Sheet l3Af/amey Jan. 29, 1929.

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F. A. STEARN TELEPHONE SYSTEM Filed Dec. 4, 1926 18 Sheets-Sheet '18 3/arm flan/M2714.

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STATS FATE? FFEQF...

FRANKLIN A. STEARN, OF ORANGE, NEVJ' JERSEY, ASSIGNOR TO WESTERNELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEWYORK.

TELEPHONE SYSTEM.

Application filed December 4, 1926. Sgrial No. 152,594.

This invention relates to telephone exchange systems in whichconnections are established by means of automatic switching apparatusoperated under control of central oilice register senders.

According to the present invention a number of decoding devices areprovided in common to a number of senders, with means for associatingsimultaneously a plurality of said devices with respective senders fordecoding registrations established in said senders, and for thereuponsetting the switch controlling registers of such senders in accordancewith the decoded registrations.

According to another aspect of the invention, means is provided torepeatedly set a selection controlling register in accordance withdifferent portions of the recorded wanted number. According to anadditional a pect ot' the invention, a designation may be rendered ineiiective and another designation set up when a call is attempted by asubscriber whose service is restricted.

Briefly, the operation of the system is as follows: The initiation of acall causes the association of an idle sender with the first or districtselector. The series of impulses corresponding to the otlice code arefirst registered, whereupon the decoder is connected with the sender.The decoder then deciphers the registered oflice code, designates asingle point or relay individual to the route to be employed in reachingthe wanted otlice and operates the selection controlling register of thesender. At the same time, the number of the wanted substation isrecorded. When the trunk to the wanted ofiice has been selected underthe control of the selection register, this register is released and isreset in accordance with the recorded substation numher. It the wantedotiice is a machine switching oiiice, this register now controls theswitches at that oflice to select the wanted line, whereas it the wantedoliice is a manual ol'lice, the dial register controls the transmissionof code impulses to set the relay call indicator at that otlice.

A clearer understanding of the invention will be obtained from aconsideration of the following description in connection with theappended claims and attached drawings in which,

Figs. 1 and 2 show the relationship between senders and decoders with adecoder connector in more detail;

Fig. 3 shows a calling substation, a district selector circuit indetail, and a diagrammatic showing of the train of switches forconnecting the district selector with 0. called substation;

Figs. 4: and 5 show the control apparatus of the sender, Fig. 4including a schematic showing of a link circuit;

Fig. 6 shows the counting relays which control the selections;

Figs. 7, 8 and 9 show the recording or dial register oi the sender;

Fig. 10 shows the selection register of the sender;

Figs. 11 and 12 show the decoder connector;

Fig. 13 shows the incoming register of the decoder;

Figs. 14 and 15 show the outgoing register of the decoder;

Figs. 16, 17 and 18 show the deciphering apparatus;

Fig. 19 shows the manner in which Figs. 3 to 18 should be arranged; and

Fig. 20 shows the manner in which Figs. 1 and 2 should be arranged.

Detailed description.

Referring first to Figs. 3 to 18, let it be assumed that the subscriberat substation 301 wishes to converse with the subscriber at staion 302whose line terminates in a machine switching ol'lice and whose number isFalmouth 6780. The district selector shown is of the type disclosed inUnited States Patent 1,589,402 to O. H, Kopp, granted June 22, 1926.This type of district selector is associated with an idle sender bymeans of a link circuit and normally stands associated with a link andwith its sequence switch in position 2. Reference is made to the abovementioned patent for the operation of the link circuit and that of thedistrict selector in advancing to position 2.

The removal of the receiver at substation 301 causes certain operationsdescribed in the said Kopp patent to take place, which result in theconnection of ground to conductor 303 through the link circuit 490. Thiscompletes a circuit extending from conductor 303 over the upper contactsof cam 304, winding of relay 305 to battery. Relay 305 operates andcloses a circuit from ground over the lower left contact of cam 306,right front contact of relay 305, upper left contact of cam 307, toconductor 308 and the link circuit,

ground.

which causes the link circuit to start hunting for an idle sender. Relay305 also closes aeircuit from battery through the winding of line finderup-drive magnet 309, outer left front contact of relay 305, lower leftcontact of cam 310, right front contact of relay 305, to ground at thelower left contact of cam 306. The line finder is moved upward under thecontrol of magnet 309 in search of the calling line which is identifiedby battery connected to terminal 319. As soon as the line iinder startsupward, a locking circuit is closed for reay 305, over the inner leftfront contact, upper left contact of cam 311, back contact of relay 312,commutator strip 313, brush 314 to The link circuit in starting itsoperation also connects ground to conductor 315, completing a circuitover the upper left contact of cam 316, upper left contact of cam 317,left winding of relay 318 to battery. Relay 318 operates and locks overits outer left front contact, lower right and upper left contacts of cam345 to ground. When the line finder brushes encounter the terminals ofthe calling line, battery connected to terminal 319 completes a circuitthrough the winding of relay 312, upper contacts of cam 320 to ground atthe lower contact of cam 321. Relay 312 operates in this circuit,shunting its winding by resistance 365 and opening the locking circuitof relay 305. The release of relay 305 opens the circuit of up-drivemagnet 309, bringing the line finder to rest on the terminals of thecalling line. l/Vith relay 305 released and relay 318 operated, acircuit is closed from battery through the winding of sequence switchmagnet 300, lower right contact of cam 327, right front contact of relay318, inner right back contact of relay 305, to ground at the lower leftcontact of relay 306, advancing sequence switch 300 to position 3,wherupon relay 318 is released. With sequence switch 300 in positions 3to 18, inclusive, battery is connected through resistance 322 over thelower left contact of cam 323, lower back contact of relay 324,resistance 325, to terminal 326 to mark the calling line busy as long asit is engaged by the line finder brushes.

In the meantime, the sender selector of link 490 has been hunting anidle sender. An idle sender is characterized'by battery through 150 ohmsresistances connected to its test conductor 401, the circuit for whichmay be traced over the back contact of relay 402, back contact of relay403, back contact of relay 404, resistance 405 to battery. When thesender selector encounters this battery, the link circuit is operated toconnect sender control condu'tor 406 of the sender through to conductor428 of the district selector. When sequence switch 300 reaches position3, therefore, a circuit is closed from battery through the lower Windingof relay 324, upper right contact of cam 330, conductor 328, through thelink circuit to conductor 406,right back contact of relay 407, innerright back cont-act of relay 408, conductor 409, through the middle andright windings of relay 501 to ground. Relay 324 is marginal and doesnot operate at this time. Relay 501 operates, closing an obvious circuitfor relay 502. Relay 502, in operating, closes a circuit from groundover its left front contact, upper right contact of cam 410, leftwinding of relay 411 to battery. Relay 411 operates and closes anobvious circuit for sequence magnet 400, advancing the sequence switchto position 2. Relays 411 and 445 may now be operated under the controlof inter rupters 447, and 449 to advance sequence switch 400, thusserving to time the various functions of the sender and to cause alarmsand signals to be operated, if these functions do not take place in theallotted length of time. These operations will be described in detaillater. Relay 502 also closes a circuit from ground at its left frontcontact, to the winding of relay 413, resistance 412 and battery,operating relay 413 which closes the holding circuit for itself at itsoutermost contact and grounds conductor 414, which is also grounded overthe upper left contact of cam 415 by the advance of sequence switch 400to position 2. The connection of ground to conductor 414 completes acircuit for re lay 403, which in turn operates relay 462 and relay 404.Relay 403 also disconnects battery from contact 401 to prevent theselection of this sender by another link circuit. This also serves tocause the link circuit to connect the pulsing conductors, thefundamental circuit conductors and the sender control conductor throughfrom the district selector directly to the sender. That is, it connectsconductors 328, 315, 331, 308 and 303 through to conductors 406, 416,417, 419 and 418, respectively.

Registration 0 f called member.

The dialing circuit may now be traced from battery through the leftwinding of relay 420, inner left back contact of relay 421, conductor417, through the link circuit to conductor 331, lower left contact ofcam 366, lowermost contact of relay 324, terminal 333, over thesubscribers line back to terminal 334, upper back contact of relay 324,left contact of cam 366, conductor 331, through the link circuit toconductor 416, outer left back contact of relay 421, resistance 422,outer left back contact of relay 407 to ground. The pulsing relay 420operates in this circuit closing a circuit from ground at the inner leftback contact of relay 423, front contact of relay 420, -winding of relay424, to battery. Relay 424, in turn, closes an obvious circuit for relay425 and relay 425 closes one for relay 426. Relays 425 and 426 areslow-torelease and hence are not released during short interruptions ofthe circuit of relay

